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LHR · London, United Kingdom

Reviewed July 27, 2026

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What Time Should I Leave for Heathrow Airport (LHR)?

For Heathrow, target arrival 2 hours before a UK, Ireland or European flight and 3 hours before a long-haul flight, following Heathrow's published guidance. Then add the trip for the time you will actually travel plus parking, rail connections and the walk to your correct terminal.

Your Trip

Planning this trip

Departure time

Flight type

Route

Leaving from

Airport

Add where you are leaving from, or enter the journey time manually.

✓

Already Included

✓Heathrow security (London Heathrow (LHR))
✓Parking or curb access
✓UK, Ireland or Europe timing
✓Live traffic conditions

Your leave time includes

✓Live traffic
✓Heathrow security allowance
✓Parking and terminal walking
✓Airport-specific timing
✓UK, Ireland or Europe recommendations

Example Time to Leave

10:30 AM European flight · Paddington · Elizabeth line

Leave Paddington around 7:30 AM

  • 8:30 AM terminal arrival target
  • Allow for the correct terminal stop and station-to-check-in walk
  • Use the calculator for the scheduled rail journey and connection margin

Heathrow Airport-specific planning details that change when you should leave

Heathrow is four different departure journeys, not one airport pin. Terminals 2 and 3 use the central terminal area reached from the M4 spur, while Terminals 4 and 5 have separate approaches near M25 Junction 14. Rail services also stop differently by terminal. A useful leave-time calculation must start with the correct terminal, then work backward through the terminal walk, security and bag drop, the rail or road journey, and enough margin for a missed connection or congested airport approach.

Operational details can change, so verify your terminal and travel schedule before departure.

Four terminals, three road approaches

  • For Terminals 2 and 3, Heathrow directs drivers via M4 Junction 4 or M25 Junction 15 into the central terminal area.
  • For Terminals 4 and 5, Heathrow recommends M25 Junction 14. Terminal 5 has its own spur road; Terminal 4 uses the southern airport approach.
  • Route to the exact terminal, car park or drop-off zone—not merely to 'Heathrow Airport'. The final airport roads are part of the journey.

The terminal journey continues after security

  • Heathrow currently recommends terminal arrival 2 hours before UK, Ireland or European flights and 3 hours before long-haul flights.
  • Published walking guidance estimates about 20 minutes from security to Terminal 2B gates and most Terminal 3 gates, and about 15 minutes to Terminal 5B or 5C gates via transit.
  • Your airline's check-in and bag-drop deadline can be earlier than the security time implied by the calculator, so the airline deadline always wins.

Rail, parking and forecourt choices

  • Heathrow Express serves Paddington and the airport; the Elizabeth and Piccadilly lines provide additional London routes. Select the service and terminal stop before calculating.
  • Park & Ride requires a transfer bus, commonly running at scheduled intervals. Add waiting, luggage loading and the terminal walk rather than counting only the drive to the car park.
  • The terminal drop-off zone carries a charge and does not allow waiting or pickup. Free drop-off at Park & Ride costs time instead of the forecourt fee.

Worked examples for leaving for LHR

Each example is illustrative, not live traffic guidance. The assumptions are shown so you can see the calculation and replace them with your own details above.

Paddington -> LHR Terminal 5

10:30 AM European flight · rail · carry-on only

Assumptions

  • 2-hour terminal-arrival target from Heathrow guidance
  • Scheduled rail journey plus station access and service margin
  • Time to move from the Terminal 5 station to departures

Work backward

  1. Flight departure: 10:30 AM
  2. Terminal arrival target: 8:30 AM
  3. Protect one service interval and the station-to-check-in walk
  4. Check the live rail schedule before leaving

Illustrative Paddington departure: about 7:30 AM

Cambridge -> LHR Terminal 3

6:00 PM long-haul flight · driving · Park & Ride

Assumptions

  • 3-hour terminal-arrival target from Heathrow guidance
  • M11, M25 and M4 traffic must be calculated for the afternoon
  • Parking, shuttle wait and terminal transfer are separate steps

Work backward

  1. Flight departure: 6:00 PM
  2. Terminal arrival target: 3:00 PM
  3. Reach Park & Ride before the terminal target
  4. Subtract the traffic-aware road journey last

Use the calculator above for a route-specific leave time

Reading -> LHR Terminal 5

8:15 AM long-haul flight · RailAir coach connection

Assumptions

  • 3-hour terminal-arrival target
  • Scheduled coach time plus station connection margin
  • Terminal 5 station-to-departures movement

Work backward

  1. Flight departure: 8:15 AM
  2. Terminal arrival target: 5:15 AM
  3. Choose a coach that arrives before the target
  4. Protect one realistic connection or service-delay cushion

Check the first-day service timetable before relying on this route

Traffic and service conditions vary. Use the live calculator for your trip and check official transportation schedules before leaving.

How to use this page safely

Stable planning facts—such as terminal names and airport transfer options—belong in this guide. Traffic, security waits, airline terminals and service disruptions are volatile, so the calculator or official operator should supply the current answer.

Recheck your airline terminal, bag-drop deadline, airport transit schedule and transfer service on the day you travel.

Planning and traffic sources

Facts on this page were checked against airport, transit, security and traffic sources. Reviewed July 27, 2026.

Heathrow Airport leave-time questions

What time should I leave for Heathrow Airport (LHR)?

For Heathrow, target arrival 2 hours before a UK, Ireland or European flight and 3 hours before a long-haul flight, following Heathrow's published guidance. Then add the trip for the time you will actually travel plus parking, rail connections and the walk to your correct terminal.

How early should I arrive at LHR?

Use about 2 hours before uk, ireland or europe and 3 hours before long-haul as a planning baseline. Add time for parking, rail or terminal transfers, and follow any earlier deadline supplied by your airline.

Does the LHR calculator include road and transit time?

Yes. Enter your starting location, flight time and arrival method to estimate a traffic-aware drive or scheduled public-transit trip. The result also includes airport-processing assumptions.

What local airport timing details matter at LHR?

At LHR, confirm Terminal 2, 3, 4 or 5 first. Terminals use different motorway approaches and rail stops, Park & Ride adds a bus transfer, and some gates can be a 15-to-20-minute journey from security.

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